USER32: Implement SPI_{GET,SET}MINIMIZEDMETRICS

[jchevrier at nexicom.net]

Changelog:

*Implemented SPI_GETMINIMIZEDMETRICS calculated from values returned by 
GetSystemMetrics. The math applied to the values returned from 
GetSystemMetrics was verified against Windows 98 and XP using a simple test 
program.

*Implemented SPI_SETMINIMIZEDMETRICS. Determined that the values set here are 
valid for the current session only and will not persist across reboots. This 
makes it a simple opposing function to SPI_GETMINIMIZEDMETRICS.
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